These apps could help reduce panic and aid first responders to where someone might be located.

There is nothing more nerve wracking than not knowing where someone important to you is during a disaster. The emergence of Twitter has provided an avenue of sorts for people to find out if someone has made it out alive. But if it is ever to the point in which loved ones, or employees in your organization, have not yet been found, these apps could help emergency personnel locate them.

You are required to set a panic number or mail address and the phone will send a message, which contains your address and location. It uses GPS/Network (where available on iPhone and iPad 3G) to determine your location or Wifi (on the iPod touch and iPad Wifi)

According to a few reviews, make sure to check with the company on any extra costs associated with upgrades or customizations.

Maybe you are frantically looking everywhere for your lost loved one. This app will help you locate the disaster shelters in your area. You can view open shelters by state and also find the latest disaster information via the Red Cross Disaster Online Newsroom.

ReUnite provides ability to upload missing and found person information for family reunification during and after disasters. It provides structured information to the National Library of Medicine's People Locator service.

SirenGPS connects everyone in a community to first responders and allows first responders to communicate with each other, all on a single platform. It allows first responders to determine the precise location of 911 callers.